JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
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IF 2.369
Xiangmeng Chen,Xingchuan Yang,Yong Xiang,Li Xu,Guoji Liu
Humic acid-derived resin (named “RFH”) is employed for efficiently recovering gold from acidic aqueous solutions. The selectivity and effects of pH, contact time, initial concentration, and temperature on Au(III) adsorption by RFH have been studied. The RFH resin exhibited remarkable selectivity for gold ions over other metal ions and very high adsorption capacity for Au(III), up to 920 mg·g–1. The gold adsorption nicely conforms to the Freundlich isotherm model, and the removal of Au(III) from the aqueous solution by RFH resin follows pseudo-second-order kinetics. The RFH resin before and after adsorption was characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), which provided evidence for gold adsorption mechanism of RFH. The results showed that Au(III) was adsorbed on RFH, then reduced to elemental gold, and deposited on the adsorbent in the form of the element gold. We summarize the process as an adsorption–reduction–deposition mechanism. This paper provide a new way for gold recovery from aqueous acidic solutions.
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REACTIVE & FUNCTIONAL POLYMERS
·
2020
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IF 3.333
Yong Xiang,Xiangmeng Chen,Chunmei Cao,Shuaiwei Ding,Li Xu,Guoji Liu
Designing and synthesizing high activity adsorption materials for recycling precious metals is essential to meeting the needs of the high-tech industry. Here, a new adsorbent material RFU is prepared by grafting urea onto the phenolic resin by one-step hydrothermal synthesis method. It has been proved that RFU microspheres had extremely high absorption capacity and excellent selectivity (the adsorption capacity can reach 1600 mg/g when the initial concentration of Au(III) is 1 g/L) for Au(III). Different factors affecting the adsorption process such as pH, adsorption capacity, selectivity, contact time, and reusability were systematically investigated. FT-IR, SEM, TEM and XPS were used to characterize the adsorbent before and after adsorption. The adsorption isotherm was found to be consistent with the Langmuir isotherm model, and the kinetic was consistent with the pseudo-second-order kinetic model . Further regeneration and cyclic adsorption indicate that RFU can be recycled at least four times. Combining its characterization with kinetic and thermodynamic data, we drew the conclusion that N H and C = O of RFU played an important part during adsorption. The strong soft-soft interaction between N, O atoms and Au atoms gives the material excellent gold ion adsorption capacity and adsorption selectivity. These findings can broaden the path for the use of nitrogen-rich nanomaterials in gold ion recovery.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2020
·Vol. 167
·期 2
·022511
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IF 3.721
Lei Jin,Jia-Qiang Yang,Fang-Zu Yang,De-Yin Wu,Zhong-Qun Tian
Alkaloid hypoxanthine is a novel complexant for green cyanide-free Au(III) electrodeposition. In this work, the electrochemical and coordination behaviors of hypoxanthine-Au(III) ion in the green cyanide-free bath are studied. The electrochemical behavior confirms that hypoxanthine-Au(III) ion is in the irreversible two-step electro-reductions with the first controlled by diffusion and the second by diffusion and electrochemistry. The stability constant of hypoxanthine-Au(III) ion is 4.8 × 1030. DFT calculations further indicate that the optimal coordination structure is N3-Au-N7 with the N-Au average bond energy of 11.03 eV. The bath component of potassium citrate plays almost no influence, whereas the additive of sulfocompounds shows a significant effect on the electro-reduction of hypoxanthine-Au(III) ion. Based on the cyanide-free Au(III) electrodeposition bath, the obtained gold coating is fine and compact in grains without organic inclusion and in the resistivity of 2.84 × 10−8 Ω·m.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 41
·19824-19833
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IF 3.925
Xiaoxia Liu,Yang Wu,Yangyang Wang,Huiying Wei,Jinxin Guo,Yanzhao Yang
Liquid–liquid extraction technology based on ionic liquids (ILs) is an efficient and environmentally friendly method to recover Au(III). This work aims to separate Au(III) from hydrochloric acid media using a novel IL [DBA-Pyr][NTf2], which is a pyrrolidinium-based IL functionalized with amide groups. Firstly, experiments have been carried out under optimal conditions, including the concentration, acidity and temperature. It turns out that low concentrations of hydrochloric acid help in Au(III) extraction, while the increase of chloride ion concentrations has an adverse effect. Then, through Job's method, extraction complexes with a molar ratio of [DBA-Pyr][NTf2]-to-Au(III) of 1 : 1 were determined. And, the anion exchange extraction mechanism was confirmed by FT-IR, UV-Vis, and 13C NMR spectroscopies and an electrostatic potential energy (ESP). Under the optimal extraction conditions, it has excellent selectivity to Au(III) compared to both base metal ions and platinum group metals (PGMs). Furthermore, Au(III) could also be recovered from the IL phase using an aqueous solution of thiourea in 95.6% with high selectivity. After 4 cycle experiments, an extraction efficiency of more than 90% is still maintained. The results show that [DBA-Pyr][NTf2] has potential application prospects in Au(III) recovery from hydrochloric acid media.
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ACS Sustainable Chemistry & Engineering
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2021
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IF 8.198
Min Wang,Qi Wang,Junzheng Wang,Ronghao Liu,Guanju Zhang,Yanzhao Yang
Two ionic liquid (IL) thermomorphic systems were designed. The thermoregulated property exhibited by the IL systems was utilized for the recovery of Au(III) from acidic medium. The cloud point order of the two ILs was proposed and evidenced via a combination of experimental measurements and quantum chemical calculations. The impacts of salt ions and acid on the thermomorphic phase behavior of the IL–H2O binary mixture system were investigated. After comprehensive comparison, a systematic study of Au(III) extraction by the [Suc][Tf2N]2 (succinyl bis(trifluoromethylsulfonyl)imide) system was carried out because of its outstanding hydrophobicity and extraction ability. Then, a comparison between traditional liquid–liquid extraction (TLLE) and homogeneous liquid–liquid extraction (HLLE) was made during the process of optimization of various extraction parameters. In addition, the anion-exchange mechanism in the extraction process was revealed. The thermoregulated [Suc][Tf2N]2 system presented an excellent selectivity for Au(III) in a solution of coexisting multimetallic ions. Finally, Au(III) was almost completely stripped from the loaded IL phase by oxalic acid. The extraction efficiency of Au(III) using regenerated IL still maintains a surprising stability after five turns of cycling experiments. Hence, the dicationic IL [Suc][Tf2N]2 was regarded as a potential extractant for the recovery of gold.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Zhengshen Bao,Dehong Xu,Hailong Peng,Changqing Xia,Shixing Wang,Weili Li
Efficient recovery of Au (III) from aqueous wastewater is of great significance for resource utilization and environmental protection. Herein, azine-functionalized Zr-based MOFs (hereinafter referred to as AZA-Zr-MOFs) were prepared via a facile one-pot solvothermal route using 2,2'-diamino-4,4'-(4-amino-1,2,4-triazole-3,5-diyl) dibenzoyl acid as the organic linker. The abundant triazole and amino groups on the MOF surface provide multiple active sites for multi-nitrogen synergistic coordination, thus enhancing the selective capture of Au (III) in aqueous solution. The obtained AZA-Zr-MOFs exhibit a high maximum uptake capacity of 1176 mg/g for Au(III), along with remarkable selectivity and excellent cycling stability (＞90 % efficiency after 5 cycles) over a wide pH range (2.0~9.0). Combined with experimental analyses (X-ray photoelectron spectroscopy (XPS), zeta potential, Fourier transform infrared spectroscopy (FTIR)) and density functional theory (DFT) calculations, the liquid-phase adsorption mechanism of Au (III) is clarified as a synergistic effect of amino-assisted reduction (Au (III)→Au (0)), nitrogen-centered coordination on the MOF surface, and electrostatic interfacial interaction via protonated amino groups. This work provides a feasible preparation method for MOF-based adsorbents and reveals the key role of surface functional groups in the interfacial adsorption of Au (III), which has potential application value for Au (III) recovery from actual aqueous wastewater.
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CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Biao Feng,Chengzhang Yao,Siyu Chen,Rui Luo,Shuhui Liu,Shanshan Tong
The design and synthesis of efficient adsorbing materials for recovery of precious metal are of paramount importance for fulfilling high-tech industry’s need. Herein, a one-step hydrothermal synthesis method was employed to construct the sulfur-rich MoS 2 nanoflakes under a mild condition. The first experiment evidence proved that MoS 2 nanoflakes were capable of capturing gold, with an extremely high uptake capacity (1133 mg g −1 ) and excellent selectivity. More importantly, MoS 2 nanoflakes showed preferential Au 3+ uptake behaviour compared with other precious metal ions such as Pd 2+ (47.6 mg g −1 ) and Pt 4+ (38.5 mg g −1 ). Different factors affecting the sorption process such as pH, adsorbent amount, contact time, ion strength , and reusability were systematically studied. The adsorption mechanism may be attributed to their intrinsically sulfur-rich characteristic for the strong soft–soft interactions between S atoms and Au atoms. These findings open up the possibility to expand the applications of sulfur-rich nanomaterials in the recovery of precious metal.
研究领域:
材料科学
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环境化学
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纳米技术
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资源回收
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配位化学
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JOURNAL OF POLYMER RESEARCH
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2023
·Vol. 30
·期 11
·1-10
·
IF 2.8
Peng Lin-Ling,Zhou Wei-Fang,Chen Min,Li Li-Jun,Liu Yu,Zhou Cong-Shan,Xie Jun,Tang Ke-Wen
A novel disulfide functionalized nitrogen-rich covalent organic polymer (S-COP) directly synthesized by a solvothermal method were characterized by XRD, SEM, FT-IR, N 2 adsorption–desorption and XPS techniques. The as-synthesized polymer shows efficient adsorption performance for Au(III) from aqueous solution. The adsorption equilibrium of the adsorbent could be achieved within 5 h, and the as-synthesized S-COP exhibits an exceedingly high Au(III) uptake capacity of 1506 mg·g −1 . Furthermore, S-COP has satisfactory selectivity and reusability, which is a highlight of adsorption materials.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 4
·1313-1319
·
IF 3.069
Xu Yang,Kunhao Yang,Li Wu,Jingkui Yang,Yujian He
Magnetic nanoparticles containing multiform heteroatoms on their surface have great potential for metal-ion recovery with a high throughput. In this study, a novel adsorbent (Fe3O4@CPTES@PEG) was developed to adsorb Au(III) from aqueous solution, which was synthesized by functionalizing Fe3O4 magnetic nanoparticles with poly(ethylene glycol) via a simple two-step reaction. Various techniques including Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), vibrating sample magnetometry (VSM), transmission electron microscopy (TEM) and X-ray diffraction spectroscopy (XRD) were used to characterize the adsorbent, demonstrating that poly(ethylene glycol) was successfully grafted onto the Fe3O4 magnetic nanoparticles. Batch experiments were performed to investigate the effects of the initial concentration of Au(III), contact time and coexisting ions on the absorption of Au(III) from an aqueous solution at pH = 1.0. Simultaneously, the adsorption process was well-fitted with the Langmuir and pseudo-second-order models. The as-synthesized core–shell structured Fe3O4@CPTES@PEG showed a high performance towards Au(III) adsorption with the maximum adsorption capacity of about 83 mg g−1. Significantly, the material exhibited highly selective adsorption toward Au(III) in the presence of coexisting ions (Fe(III), Mn(II), Pb(II), Cd(II), Cu(II), Cr(III), Al(III), Mg(II), Zn(II) and Au(III)). Also, the material could be regenerated using ferrous sulfate, and exhibited excellent reutilization for at least three times without significant loss in its adsorption capacity after a simple post-treatment. Therefore, the proposed method shows enormous potential for practical applications in the selective separation and enrichment of Au(III) from aqueous solution at pH = 1.0.
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HYDROMETALLURGY
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2024
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IF 4.8
Ronghao Liu,Jun Li,Xiaoxia Liu,Xiaolu Yin,Yanzhao Yang
The effective and environmentally friendly recovery of gold from secondary resources has recently received increased attention. Hydrophobic deep eutectic solvent (HDES) composed of N , N -di-butylacetamide and 1-decanoic acid was used to construct the liquid-liquid extraction system to extract Au(III) from HCl medium. At first, DSC, TGA, FT-IR, and 1 H NMR were used to describe the evidence of internal hydrogen bond interaction. The above evidence was verified in the molecular dynamics study of HDES. Then, a series of optimization experiments were carried out to investigate the extraction behaviors of HDES. Based on the results of optimization experiments, response surface method was used to explore the best experimental conditions and the results showed that HDES extracted 99% Au(III) under 0.56 mol/L HCl, 2.19 mol/L NaCl, and 5.83 mmol/L Au(III), and the maximum loading reached 77.0 mg/g. Further studies on the kinetics and thermodynamics of the extraction were used to propose an ion association mechanism. In addition, using 0.1 mol/L thiourea as the stripping agent, HDES displayed outstanding Au(III) selectivity and maintained the extraction efficiency in tests which involved 5-cycles. Overall, this study provides a green and efficient Au(III) recovery strategy for secondary resources.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Xiaojun Luo,Yang Fan,Xingju Li,Yunxin Zhang,Jiaxin Chen,Panjie Li
Rising gold demand calls for sustainable extraction methods that go beyond conventional mining-dependent hydrometallurgy and pyrometallurgy approaches, as these traditional methods are plagued by inefficiency, high costs, and significant environmental risks. Adsorption-based methods using materials such as activated carbon or metal-organic frameworks have emerged as alternatives but face limitations in selectivity, stability, and mass transfer efficiency. This study introduces a sulfur- and nitrogen-functionalized 1D covalent organic framework (COF) with a 4-c sql topology, designed to overcome these challenges. Unlike 2D/3D COFs, the 1D structure minimizes interlayer stacking and enhances active site exposure, enabling rapid Au(III) detection (via fluorescence/colorimetric dual sensing) and in situ reduction to Au(0) without external reductants. Leveraging Au–S/N bonds and H-bonding interactions, the material achieved a low detection limit (8.5 × 10 −9 M) and high adsorption efficiency in real-world scenarios, including river water and computer CPU leachates. The 1D COF's unidirectional electron channels and sulfur-rich moieties further improved selectivity and kinetics. This work demonstrates a dual-function platform for gold detection and recovery, offering a sustainable solution to mitigate e-waste hazards while advancing resource circularity. The findings highlight the potential of structurally engineered 1D COFs in precision metal recycling and environmental remediation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Jia Zhao,Yi Yu,Xiaolong Xu,Shuxia Di,Bolin Wang,Hao Xu,Jun Ni,LingLing Guo,Zhiyan Pan,Xiaonian Li
High-valent Au(III) complexes have attracted much attention as catalysts in many reactions. Nevertheless Au(III) catalysts suffer from instability of the oxidized metal complexes during preparation and use. Herein, we demonstrated that Au(III) catalysts can be stabilized against reduction to metallic Au 0 by modifying supported-ionic-liquid-phase-stabilized Au(III) catalyst with CuCl 2 . It was found that the that reduced Au 0 could be re-oxidized in situ to Au 3+ species by CuCl 2 during the reaction and further stabilized by the electron transfer from Cu to these active species. When evaluated in the acetylene hydrochlorination reaction, the Au-Cu-IL/AC catalyst displayed an excellent specific activity with the turnover frequency (TOF) as high as 168.5 h −1 and more than 99.8% selectivity for the product, vinyl chloride (VCM). Furthermore, the Au-Cu-IL/AC catalyst demonstrated a stable catalytic performance with a negligible loss of C 2 H 2 conversion after 500 h under typical industrial reaction conditions for acetylene hydrochlorination. Therefore, the findings of this work provide an efficient approach for designing stable high-valent metals for long-term operation, and also pave the way for the application of Au-Cu-IL/AC catalyst in industrial VCM production.
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